Bug: printf() isn't working as expected

[patricus3]

Contact Details

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What happened?

hello. found a weird issue with printf, I don't know why this happens, but if I compile my example calculator app, it doesn't print to stdout until you fill out all needed stuff, here's the C code.

#include<stdio.h>
#include<stdlib.h>
int main(){
    printf("welcome in  calculator.");
    char *choice=malloc(sizeof(char));
    printf("type in the operator");
    scanf("%c",choice);
    switch(*choice)
    {
        case '/':
            free(choice);
            printf("first number");
            int64_t *num1=malloc(sizeof(int64_t));
            int64_t *num2=malloc(sizeof(int64_t));
            printf("first number");
            scanf("%lld",num1);
            printf("second number");
            scanf("%lld",num2);
            int64_t *result=malloc(sizeof(int64_t));
            *result =*num1 / *num2;
            free(num1);
            free(num2);
            printf("%lld",*result);
            free(result);
            break;
        case '+':
            free(choice);
            int64_t *Num1=malloc(sizeof(int64_t));
            int64_t *Num2=malloc(sizeof(int64_t));
            printf("type in first number");
            scanf("%lld",Num1);
            printf("second number");
            scanf("%lld",Num2);
            int64_t *Result=malloc(sizeof(int64_t));
            *Result= *Num1+ *Num2;
            free(Num1);
            free(Num2);
            printf("%lld",*Result);
            free(Result);
            break;
        case '*':
            free(choice);
            int64_t *n1=malloc(sizeof(int64_t));
            int64_t *n2=malloc(sizeof(int64_t));
            scanf("%lld",n1);
            scanf("%lld",n2);
            int64_t *res=malloc(sizeof(int64_t));
            *res= *n1 * *n2;
            free(n1);
            free(n2);
            printf("%lld",*res);
            free(res);
            break;
        case '-':
            free(choice);
            int64_t *N1=malloc(sizeof(int64_t));
            int64_t *N2=malloc(sizeof(int64_t));
            printf("type in the first number");
            scanf("%lld",N1);
            printf("type in second number");
            scanf("%lld",N2);
            int64_t *Res=malloc(sizeof(int64_t));
            *Res= *N1- *N2;
            free(N1);
            free(N2);
            printf("%lld",*Res);
            free(Res);
            break;
    }
}

Version

cosmocc (GCC) 14.1.0

What operating system are you seeing the problem on?

Mac

Relevant log output

No response